Joint fits to the baryon‐to‐photon number ratio, ﹩\mathrm{log}\,\eta _{10}﹩, and the equivalent number of light neutrino species ﹩N_{\nu }﹩ using a χ² analysis with the code developed by Fiorentini et al. (1998) and Lisi et al. (1999) (a) for primordial abundance values ﹩Y_{p}﹩ (this paper), (D/H)_p (Burles & Tytler 1998b), and (⁷Li/H)_p (Bonifacio & Molaro 1997) and (b) for best choice of primordial abundance values ﹩Y_{p}﹩ (this paper), (D/H)_p (Levshakov et al. 1999), and (⁷Li/H)_p (Vauclair & Charbonnel 1998). The minimum value ﹩\chi ^{2}_{\mathrm{min}\,}=0.001﹩ in the latter case is achieved for ﹩\mathrm{log}\,\eta _{10}=0.648﹩ (﹩\eta =4.45\times 10^{-10}﹩) and ﹩N_{\nu }=3.006﹩ (filled circle). Thin and thick solid lines are 1 σ and 2 σ deviations, respectively. The experimental value ﹩N_{\nu }=2.993﹩ (Caso et al. 1998) is shown by dashed line.